Method of manufacturing fuel pumps

ABSTRACT

A method of manufacturing a fuel pump is disclosed which simplifies present methods in that an integral casting of a portion of the housing has a valve chamber and a pulsator chamber cast therein having a common wall. A restricted port is provided by drilling through the wall, access for a drill being had through an open end of the casting. Most modifications show the previously described method. Completion of the fuel pump is accomplished by securing another casting to the previously described casting at the open end. Other modifications are disclosed wherein a restricted port is provided in an insertable disc force fitted intermediate the valve chamber and pulsator chamber to effect the common wall.

Q Unite States Patent 1 [111 3,803,686 Phillips Apr. 16, 1974 [54] METHOD OF MANUFACTURING FUEL 3,252,425 5/1966 Witt 417/542 PUMPS 2,929,333 3/1960 Harry 417/542 [76] inventor: Claude F. Phillips, 411 NW. th FOREIGN PATENTS 0R APPLICATIONS St., Fairfield, Ill. 62837 16,594 8/1901 Great Britain 417/542 22 Filed: Nov. 1971 1 Primary Examiner-Charles W. Lanham [2 PP 203,344 Assistant Examiner-M. J. Keenan Reated US Application Data Attorney, Agent, or Firm-Zalkind, Horne & Shuster Division of Ser. No. 889,831, Dec. 24, I969,

abandoned, which is a division of Ser. N0. 566,504, ABSTRACT July 20, 1969, abandoned, Continuation of Ser. No. A method f manufacturing a f l pump i di l d May 1969* 3530991 which simplifies present methods in that an integral casting of a portion of the housing has a valve cham- [52] U.S.C(il. 29/156.4 her and a pulsator chamber cast therein having a mon A restricted p is provided Fleld of Search through the wall access for a being had through 137/207 an open end of the casting. Most modifications show the previously described method. Completion of the [56] References cued fuel pump is accomplished by securing another casting UNITED STATES PATENTS to the previously described casting at the open end. 2,405,466 8/1946 Tabb 417/542 Other modifications are disclosed wherein a restricted 3,261,540 7/1966 Valbjorn 29/ 156.4 R port is provided in an insertable disc force fitted inter- 3,2 .377 12/1965 Hicks 417/542 mediate the valve chamber and pulsator chamber to 3,370,543 2/1968 Phillips 137 207 ff the common WalL 3,617,157 11/1971 Phillips 417/542 3,530,991 9/1970 2 Claims, 6 Drawing Figures Phillips 41 7/542 PATENTEDAPR 15 m4 SHEET 2 BF 2 METHOD OF MANUFACTURING FUEL PUMPS This application is a division of an application by the same inventor, Ser. No. 889,831 filed Dec. 24, 1969, abandoned, and which in turn was a division of an application filed by the same inventor, Ser. No. 566,504, filed July 20, 1969, abandoned, of which a continuation by the same inventor Ser. No. 833,856 filed May 29, 1969 became U.S. Pat. No. 3,530,991.

It has been found that the efficiency of a fuel pump is enhanced by the use of a restricted port between the inlet passage and a pulsator chamber and can still be further enhanced by effecting a restricted port between the outlet passage and the pulsator chamber. Such passages are actually part of the respective valve chambers of the pump.

Various objects and features of the invention will be apparent from the description which follows taken in conjunction with the appended drawing in which:

FIG. 1 is a fragmentary illustration in cross sectional elevation of one form of the invention taken on section line ll of FIG. 3;

FIG. 2 is a cross sectional elevation through 2-2 of the view shown in FIG. 3;

FIG. 3 is a perspective of this form of the invention;

FIG. 4 is a cross section in elevation through 44 of FIG. 6; and

FIG. 5 is a cross section in elevation through 5-5 of FIG. 6.

FIG. 6 is a perspective of another modified form of pump with the fuel casting at the top of the assembly.

FIGS. 1 through 6 illustrate other embodiments of pumps using restricted inletports to-air chambers for both the inlet and outlet sides of the pumps illustrated. A particular feature of the pumps shown in FIGS. 1-6 is that of ready reversibility wherein the fuel casting may be mounted at the top or bottom of the pump as related to an automobile engine. Thus, the comparison of FIGS. 3 and 6, showing perspectives, will make this clear.

The fuel castings are identical, as are the body castings, and the only distinction,insofar as determining whether a pump of the general construction shown is to be used in inverted position, ismerely a matter of where the restricted ports for the pulsator chambers are located with relation to the vertical dimension of the chambers.

A very important manufacturing economy thus results since all castings are identical and all assemblies are identical and determination of pump mounting orientation is merely a matter of drilling holes through a wall common to the fuel passages and the respective pulsator chambers.

For example, comparison of FIGS. 1 and 4 will make it apparent that FIG. 21 is merely an inverted mirror image of FIG. 1 except that the restricted port 120 is located just above the inlet valve 125 in FIG. 1 for the inlet pulsator chamber 130 wherein in FIG. 4 the restricted port 120 is located near the bottom of the pulsator chamber 130.

In each instance, the restricted ports are effected by drilling in the casting through a wall such as 133 which is common to the inlet cavity 136 and the pulsator chamber 130. Such drilling is readily accomplished through the inlet (FIG. 4) or outlet (FIG. 5) or through the valve openings (FIGS. 1,2) before valve insertion. An open bore at the top of the pulsator chamber, ef-

fected in the casting process is for chip cleaning and mold coring, which opening is then plug-closed as by a force fitted disc 140 suitably pressed and swaged in place as shown, after the pulsator port has been drilled.

The very considerable manufacturing economy will be evident from the above description, in that all castings are made the same, with an open-ended pulsator chamber bore, and such castings can be stored ready for drilling pursuant to demand for particular mounting.

In the same manner, comparison of FIGS. 2 and 5 will make it apparent that the outlet cavities 143 have a common wall 146 with the outlet pulsator chambers 150 and, accordingly, drilling a restricted port such as through the common wall as shown in FIG. 2, or a restricted port as shown in FIG. 5, determines the relative position of the assembled pump with respect to an engine.

The fuel castings are die cast in the configuration shown in FIGS. 3 and 6, FIG. 6 merely showing the inverted position of FIG. 3. It is obvious that the same size bores and plugs 140 can be used for both inlet and outlet pulsator chambers.

Thus, each fuel casting comprises an inlet port leading to the inlet cavity and an outlet port leading from the outlet cavity, each such cavity having a pulsator chamber with a common wall therebetween. The symmetrical arrangement of the cavities and the pulsator chambers will be clear from FIGS. 3 and 6 thereby producing a pump which is relatively easy to cast and of smooth and pleasing appearance.

The valves such as valve 125 are identical for both inlet and outlet sides of the pump and are set into the inlet and outlet cavities through the open pump chamber during assembly with the body casting in a well-known manner. The valves are held by force fit and supported on ribs disposed longitudinally on the walls of the cavities, there being a plurality of such ribs wherein the valves are pushed against the radially extending ends thereof.

The actuation is effected in a fully conventional manner as by a reciprocal stem and diaphragm as shown.

I claim:

1. A method of manufacturing a pump having a pair of body members which comprises casting a pump body member with a pair of adjoining cavities to effect a valve chamber and a pulsator chamber with a common wall therebetween; wherein at least one of said cavities has an opening accessible to a drill; drilling a hole through said common wall to effect communication between said cavities;

wherein said cavities have openings at opposite ends of the casting, one such opening being at an interior face of said casting; inserting a valve therein to effect a valve chamber; the other opening being at the exterior end of said casting, closing said latter opening to effect a pulsator chamber; and securing a second body member to said first-mentioned body member with a pump diaphragm between said body members to effect a pumping chamber exposed to said valve.

2. A method of manufacturing a pump having a pair of body members which comprises casting a pump body member with a pair of adjoining cavities to effect a valve chamber and a pulsator chamber with a common wall therebetween; wherein at least one of said cavities has an opening accessible to a drill; drilling a an outlet valve in the other said valve chamber; securing a second body to said first-mentioned body member with a pump diaphragm therebetween to effect a pump chamber exposed to said valves; and closing the open end of each said pulsator chamber.

* ii I I 

1. A method of manufacturing a pump having a pair of body members which comprises casting a pump body member with a pair of adjoining cavities to effect a valve chamber and a pulsator chamber with a common wall therebetween; wherein at least one of said cavities has an opening accessible to a drill; drilling a hole through said common wall to effect communication between said cavities; wherein said cavities have openings at opposite ends of the casting, one such opening being at an interior face of said casting; inserting a valve therein to effect a valve chamber; the other opening being at the exterior end of said casting, closing said latter opening to effect a pulsator chamber; and securing a second body member to said first-mentioned body member with a pump diaphragm between said body members to effect a pumping chamber exposed to said valve.
 2. A method of manufacturing a pump having a pair of body members which comprises casting a pump body member with a pair of adjoining cavities to effect a valve chamber and a pulsator chamber with a common wall therebetween; wherein at least one of said cavities has an opening accessible to a drill; drilling a hole through said common wall to effect communication between said cavities; including casting an additional pair of adjoining cavities to effect another valve chamber and another pulsator chamber with a common wall wherein the chambers of each pair are open at opposite ends; drilling a hole through said latter common wall; inserting an inlet valve in one said valve chamber and an outlet valve in the other said valve chamber; securing a second body to said first-mentioned body member with a pump diaphragm therebetween to effect a pump chamber exposed to said valves; and closing the open end of each said pulsator chamber. 